Annealing container



March 10,- 1931. Hic. cAPPEL-ETAL 1,796,082

ANNEALING .CONTAINER y,FledMay 9, 1929 2 Sheets-Sheet l 1553/712012 C. Cappel March l0, 1931. H Q CAPPI-:L ETAL 1,796,082

ANNEALING CONTAINER Filed May 9 1929 2 Sheets-Sheet 2 :L 2,2\\ 1 Zivi 'Hmmm 'F-QQQQQQQ I lf@ l ,y

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Q 174/@ f I l Q l 24 r Q ,4 I l G f z5 i l J 16h/I5 l l 16p (f5 i @n/Zwartom Patented Mar. 10, 1931 narran STATES PATENT; orties HERMAN c. CAPPEL AND omiso. en oss, or DOVER, onro7V Aspsioivoi?,s To ennuie Ysrnnn ooMrnNY, or novita. 01110, A con-ronnrroir or Wnsr vineinin .ANNEALING CONTAINER Application led May 9, 1929. Serial No. 361,680.

.the coils being placed upon a base and covered With a single annealing box the carriage or base being then movedinto an annealing furnace.

Under this old method of annealing7 the furnace temperature is about 1600 degrees F. and .thirty-six to forty-two hours is required for each operation.

.Because of the size of these annealing boxes, the walls must be of considerable thickness to properly reinforce the same against the temperatures to which they are subjected and it is customaryto form these annealing boxes of cast steel or the like.

This extreme wall thickness of the annealingbox requires that the annealing furnace be operated at a very high temperature in order that the heat penetrates the annealing box and brings the coiled strips to the proper temperature. y

ThisV extreme temperature quickly burns out the lining of the annealing furnace and also rapidly deteriorates the annealing box, the average life of such annealing boxes being from fifty to eighty fires. This extreme heat frequently causes the coiled sheets to stick together, thus causing a loss in the annealino' operation. Y

- The obje-ct of the present improvement is to provide an improved annealing pot or container comprising an individual container for each stack of'coiled strips. Thus, instead of one annealing box to cover eight stacks of coils upon avcarriage or base as is customaryat present, with. the improved apparatus eight individual annealing pots or containers will be placed upon each carriage or base, a stack of coiled strips being piled wit-hin each individual container.

rlhe improved container is formed of rolled plates or the like formed into cylinder shape, open at the lower end and closed at the upper end by a head preferably concaved at its center to compensate for expansion and contraction under changing temperatures, and provided with an eye or the like by means of which the container may be placed upon or lifted from the carriage or base.

lith the use of this improved container, the furnace temperature is not nearly as high as required with the old method, the temperature being about 1350r degrees F. at the top and 1250 degrees at the bottom at the end of the operation.

Owing to thefact that each individual pot or container is substantially filled with coils, it has been found by experience that it is much easier to Control and regulate the temperature therein and when the coils are ready to come out of the furnace there is a difference of only forty to sixty degrees F. between the top and bottom temperatures within the pot.

Under this new method of annealing, only eighteen to twenty-four hours is required as compared with thirty-six to forty-two hours under the old method and owing to the reduced annealing time, ten tonsof coiled strips may be annnealed in eighteen to twenty-four hours whereas thirtyfsix to forty-two hours was required to anneal three tons under the old method.

The cost of the new apparat-us is less than half of the cost of the old apparatus and the life of the new apparatus is considerably longer. Annealing pots now in use, made in accordance with the invention, have already been used for over 200 fires andare still in good repair, whereas eighty lires was usually the maximum life of the old cast annealing boxes.

The lower temperature at which the furnace may be run when using the improved annealing containers greatly increases the life of the furnace lining and also cuts the fuel consumption in half.

.Where A69.5 pounds of coal per ton of strips annealedwas used in annealing under the old method, 819 pounds per ton are used in the same furnaces toanneal coils. in the improved annealing containers. The increased tonnage per heat also materially reduces the labor cost and it has also been found that a superior grain structure is produced in the annealed strips.

An'embodiment of the invention is .illustrated in the accompanying drawings, in which Y Y Figure 1 is a plan view of the improved annealing carriage showing several of the annealing containers or pots placed in position thereon, parts being broken away for the purpose of illustration; Fig. 2 a side elevation of the carriage; and

Fig. 3, an enlarged transverse sectional view through the carriage showing the individualannealing containersy mounted thereon, one container being out in section to illustrate the manner of stacking the coiled strip therein. f Y

Similar numerals refer to similar parts throughout the drawings.

The carriage or base indicated generally at maybe formed of cast steel or the like and provided upon its under side with the usual depending longitudinal ribs 11 having the grooves 12 to receive the balls 13 whereby the carriage may be moved-into or out of the furnace in the usual manner.

Theus'ual upright flange 14C may be pro-A annular flange connected thereto, as by rivets 21, welding or otherwise, and preferably having the concaved central portion 22 y in order to permit of expansion and contraction under changing temperatures.

An eye 23 may be attached to the head in or- -der to receive a hook or the like for placing the container in position upon the carriage or base and removing it therefrom. Y

Theapparatus as illustratedin the accompanying drawings is adaptedvfor the anneal-` ing of eight stacks of coiled strips, the coils,

indicated at `24, being stacked one upon another and positioned as indicated in the drawings.

An outlet` 25, for the inert gas, is provided upon each of the pipes 16 in position to admit gas to the interior of each stack of coiled strips. Y f

After the coils are thus stacked upon the carriage vorbase, the improved annealing containers or pots are placed in position around the coils, as shown inthe drawings,

and .sand or the likemay be placed around the lower end of each container to form a seal between the same and the carriage.

In order to accommodate a thermocouple, a raised portion 26 may be formed upon the carriage or base to receive one of the annealing containers, the thermocouple 27.being inserted into a V-notch 28 in the periphery thereof, the vwires 29 leading therefrom to a pyrometer. l

After the coils and containers have been placed upon the carriage, as above described, the carriage is moved into the furnace and left there for therequired time, after which it is withdrawn and the coils are allowed to cool within the containers for the proper period of time, after'which the'containers and annealed coils are removedfrom the carriage.

After the carriage, with the containers and coils thereon, has been withdrawn from the furnace, an inert gas is admitted to the pipes 16, during the cooling period, for thepur pose of preventing oxidation of the sheets.

We claim: v

1. An annealing container for a single stack of coils and formed of a rolled platev having its edges overlapped and connected together, and a head connected to one end of said container, said head having a central concaved portion. y,

2. Anl annealing container" for a single stack of coils and formed of a rolled Vplate bent into cylindric shape and'having its edgesV overlapped and connected together, and a head connected to one end of said container, said head Ahaving' a Vcentral concaved portion.

3. Apparatus for annealingfcoils including a carriage upon which a plurality of stacks of the coils are arranged to be placed, a container for each stack adapted to rest upon the carriage, the top surface of the carriage having grooves therein, and pipes located in said grooves and having outlets around each of which a lstack of coils is adapted to be placed. p Y.

4. Apparatus for annealing a plurality of stacksof superposed coils including a carriage upon which the coils are to be stacked, and a container adapted to'enclose each stack of coils, said container being formed of a rolled plate bent into cylindric shape and having its edges overlapped and connected together, and a head having a concaved central portion connected to one end of the container.

in testimony that we claim the above, we have hereunto subscribed our names.

HERMAN C. CAPPEL. OTIS C. GROSS. 

